What do you call the tool I need?

I need to bevel one edge of an aluminum plate 15 degrees top and bottom. I need a tool like a involute gear cutter, but with a straight 15deg on both sides. Edge of the plate has a radius which the angle needs to follow, so the plate must be laying flat bolted to a subplate or fixture hanging off the edge. I'll use my VMC with the cutter in a CAT40 stub arbor.

Can you buy these or do I need one custom made ? Easier to start with an old gear cutter or a slitting saw?

1/2" thick plate, about 1/4" thick at the "point".

Thank You, Randy

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Reply to
Randy
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Randy: Double angle shank cutters might work if I'm understanding your situation correctly. If the angles you want aren't in stock they could probably make a custom one.

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Reply to
BottleBob

============ I know this tool as "double angle form cutter." There may be other names.

The 15 degree angle may be a problem for stock tooling. Is this a "chiseled in stone" requirement? 45 degree included will generate 22.5 degrees per side with a much larger selection.

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Unka' George [George McDuffee]

------------------------------------------- He that will not apply new remedies, must expect new evils: for Time is the greatest innovator: and if Time, of course, alter things to the worse, and wisdom and counsel shall not alter them to the better, what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman. Essays, "Of Innovations" (1597-1625).

Reply to
F. George McDuffee

BottleBob wrote: >

That would work; but it'll take two passes across the plate to get it done. Back in the OLD days, when I remembered being young, we'd do this with a pair of milling cutters arranged face-to-face on an arbor. Look at:

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The FR and FL styles (you'll need one of each) ought to work, if you can get them small enough to fit onto an arbor on a 40 taper machine, and if the angles are available. I don't see any 15 degree models on the NC website; but any fool with a cutter grinder could fix up a pair, or make them from pretty much any old milling cutters you happen to have lying around.

KG

Reply to
Kirk Gordon

These guys might be able to help also

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Best, Steve

Reply to
Garlicdude

=================== Which segues into a good question for our CNC gurus.

A double angle cutter needs to take two passes to cut both bevels, while a v-type tool could get top and bottom in one pass.

Assuming that you could get both types of tools in an appropriate diameter & appropriate holder, which one would you use.

With the double angle two pass, you have the ability to adjust the amount of bevel by tool compensation and z height, and can adjust each one separately. With a v-type tool, there is only one pass, but you can adjust only the tool diameter compensation to control bevel as z is fixed if both bevels are to be the same, and adjusting one changes the other.

Unka' George [George McDuffee]

------------------------------------------- He that will not apply new remedies, must expect new evils: for Time is the greatest innovator: and if Time, of course, alter things to the worse, and wisdom and counsel shall not alter them to the better, what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman. Essays, "Of Innovations" (1597-1625).

Reply to
F. George McDuffee

DA cutter would work if they made a 30 deg one.

Randy

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Reply to
Randy

And again that would work If I could get 15 degree.

looks like I need to have one made. I'll have to talk to my tool grinder guy. see what he says.

Thank You, Randy

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Reply to
Randy

The bevel could be done a number of ways depending on how many you have to do. For one or two pieces I would just do them on a bridgeport and tilt the head and use a small face mill. Even for a small number of pieces that might be the cheapest and fastest way. Clamp them flat and tilt the head

For a number of them I would make a simple fixture that you could hold the plate at 15 degrees and run down the edge with a facemill or endmill.

John

Reply to
john

Can you use a simple (pointed) 60deg. double angle cutter? One trip around the top. Drop down a level, one trip around the bottom. Needing a concave notch sounds like more expense, or needing a LH and RH cutter stacked.

Reply to
Half-nutz

for a one-off I would probably make a flycutter and do one side then flip the tool upside down to do the other side using reversed spindle rotation

Reply to
Bipolar Bear

I have radii to go around. If it were straight I'd stand the part on edge and just use a tapered end mill.

Thank You, Randy

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Reply to
Randy

With proper design a "flycutter" can cut on the side as well as on both top and bottom and so you are only limited here if the workpiece smallest inside radius is too large for the cutter body.

Reply to
Bipolar Bear

Now I get what you mean, I could make one of those. Would be slow. single flute cutter and all that.

Thank You, Randy

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Reply to
Randy

Reply to
John&Michelle

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